/Engine/Source/Runtime/Engine/Classes/Components/SkeletalMeshComponent.h
Subclasses such as DebugSkelMeshComponent keep track of errors in the anim notifies so they can be displayed to the user. This function adds an error. Errors are added uniquely and only removed when they're cleared by ClearAnimNotifyError.
virtual void ReportAnimNotifyError ( const [FText](API\Runtime\Core\Internationalization\FText) & Error, [UObject](API\Runtime\CoreUObject\UObject\UObject) * InSourceNotify )